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Phoenix Gold RSD10 - likely in an audio integrations perfect fit box, as it takes me a month to build a box nowadays

I have a good amount of ensolite and raammat from my last install so I will be using that as well.

For reference my Forester has an Alpine 9835 Deck, PG ZX475 amp, Boston Pros front stage, stock rear stage (powered by the deck), and a Elemental Designs SQ10 in a fiberglass box I built under the passenger seat. I am pretty happy with the sound of that setup (love the front stage sub), but I wouldn't mind having a bit more low end extension. That is the trade off for having a shallow sub with low excursion though.

I have another SQ10 that I never used, but there isn't a great spot to use it in the STi. It won't fit under the seat for front stage subwoofer, so if I have to put it in the hatch I figure I may as well get a subwoofer with a little more excursion.

I would like to have a simple system that doesn't add a lot of weight, and the sub setup easily removable for track days now. I also have 2 young kids so I can't have a huge box in the hatch, and the amp will go under the front seat.

I think I covered most of the questions you guys normally ask when the n00bs ask for advice. Go easy on me.

2 amps is alittle more flexible. Case in point, I have a RSDC10.4 which is dual voice coil, nominally 4ohm each. They actually measured out at 1.8ohm each so I ended up changing course midway through the install and got a 1 ohm stable mono amp to accomodate the lower impedance. A PDX-5 would be nice but the F90BT doesn't look like it will allow you go run the front separates active rather than using the stock crossovers....you'd have 2 spare channels though which allows for upgrading at minimal expense.

If you like the Boston Pro's....I'm not sure if the RSD65's will turn your crank. Lots of midbass but alittle coarse sounding.

The RSDC10 isn't very deep...but I doubt it'll fit into the AI box which is designed for a flat sub.

We have a very similar system design.....with simlar restraints with regard to retaining the utility of the vehicle. Booster seats need room.

The single PDX-4.150 will be perfect to run the front/subwoofer. Very small and powerful, and the subwoofer channel will get WELL over 300 watts at anywhere from 4-8 ohms, so it's pretty versatile. If you've got the extra dough, you could go with the PDX-1.600 as a dedicated subwoofer amp, but you really don't need to unless you're going for the ultimate. Sounds like you've done some searching, and your choice of setup so far is a good one .

hey aaron, i noticed you might be buying an audi integrations perfect fit enclosure. i actually just posted mine for sale on ebay about an hour ago :-) There is absolutley nothing wrong with it, i am selling my whole system cuz i just got an 05 745i. yeah, i'm getting old. point is, i don't want to rip apart my idrive and dash on that car....only has 18k on it! plus the stock harmon kardon isn't too bad. I will aslo be listing my ddx-8019 tonight as well as an eclipse xa-1000 and xa-4000 mounted on an audio integrations amp rack for the wrx/sti with a 5 farad cap. also, if your in to sound quality, you may know morels. i have not even thought about listing them yet, but i have a set of morel elate 6 that the local shop made up beautiful mdf spacers for that will eventually be going also.
anyway, the listing for the box and sub are here. http://cgi.ebay.com/ws/eBayISAPI.dll...m=190268996449

Forgot to ask about the steering wheel interface for the 2008 and the Pioneer AVIC-F90BT. I have read a bunch of conflicting opinions that they don't work very well for some reason. Anyone have any luck with them?